A CLASSIFICATION OF DAIRY BACTERIA. 
BY H. W. CONN, W. M. ESTEN AND W. A. STOCKING. 
In the Annual Report of this Station for 1899 there was pub- 
lished a preliminary report upon the Classification of Dairy 
Bacteria as they had been studied in our laboratory. This has 
been up to the present the only attempt made at a systematic 
arrangement of these bacteria and it has been used somewhat 
extensively by bacteriologists. The large amount of work that 
has been done since that time and the great changes that 
have occurred in the methods of description and diagnosis of 
bacteria have made that paper no longer a correct representa- 
tion of the present knowledge of dairy bacteria. Requests for 
that paper are still occasionally received, but inasmuch as it 
is so far from representing the present state of the known facts 
it is no longer regarded as advisable to distribute the paper 
in question. For this reason, as well as because of the accu- 
mulation of a large amount of further information, it is thought 
wise to publish at the present time a second paper upon the 
same subject, bringing the facts up to date. The previous 
paper has served a purpose. It was recognized when it was 
published, that it was only a temporary expedient, designed 
as a stepping stone toward something better. It is hoped that 
the present may serve a better purpose in the same direction 
and bring us nearer to a clear, satisfactory classification of 
dairy bacteria. 
Since the publication of the previous paper we have done a 
large amount of work upon these bacteria. Most of it has been 
done in the laboratory of Wesleyan University by H. W. Conn 
and W.M. Esten. A considerable portion has been done in the 
laboratory at Storrs by W. A. Stocking and this paper is there- 
fore the combined results of the two laboratories. The actual 
writing of the paper and the arrangement of the scheme of 
classification has been done by H. W. Conn who is therefore 
